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Keywords: strake
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Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-528
... being excited with corresponding greater fatigue damage rates. frequency domain viv analysis vt technique slwr strake prediction riser domain analysis hviv configuration buoyancy fatigue damage scr case 5 analysis technique total damage comparison upstream oil & gas load...
Proceedings Papers

Paper presented at the The 26th International Ocean and Polar Engineering Conference, June 26–July 2, 2016
Paper Number: ISOPE-I-16-029
... response amplitude becomes much larger as a result of resonance. To mitigate VIM response, spars are conventionally equipped with helical strakes. Well-optimized strakes configuration can reduce VIM response up to 85% (Dijk et al., 2003). While Dijk et al. at the same time pointed out due to the limitation...
Proceedings Papers

Paper presented at the The 26th International Ocean and Polar Engineering Conference, June 26–July 2, 2016
Paper Number: ISOPE-I-16-244
... Abstract Helical strakes are widely used to suppress VIV of slender structures. In this study, the effects of the pitch and height of helical strakes on suppression of VIV were studied experimentally. Experimental results show that the ratio of strake pitch and height could be an indicator...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-762
... degrade the power conversion performance. Using simulations, vertical stabilizing strakes, attached the reacting bodies of the WECs are shown to improve average power conversion by up to 190% compared to average power conversion of the WECs without strakes. artificial intelligence natural...
Proceedings Papers

Paper presented at the The Twenty-fourth International Ocean and Polar Engineering Conference, June 15–20, 2014
Paper Number: ISOPE-I-14-311
... of offshore platforms and should be avoid as much as possible in the design stage. Two common effective ways to mitigate VIM are the configuration of helical strakes and the adjustment of mooring line stiffness. The former could change the flow pattern in the vicinity of Spar hull and the latter can change...
Proceedings Papers

Paper presented at the The Twenty-first International Offshore and Polar Engineering Conference, June 19–24, 2011
Paper Number: ISOPE-I-11-400
... on the hull motions, hull/mooring/riser coupled dynamic analyses in time domain need to be employed (Kim, et al., 2001; Hansen, et al., 2004). coefficient fpso subsea system prediction simulation riser time series heave mooring system strake upstream oil & gas frequency basin hull...
Proceedings Papers

Paper presented at the The Twenty-first International Offshore and Polar Engineering Conference, June 19–24, 2011
Paper Number: ISOPE-I-11-011
... structural-hydrodynamic interaction. The physical mechanics is generally less well understood and numerical prediction is generally less reliable. Model testing has become an important and widely accepted design procedure for optimizing strake configuration and deriving A*/D and Cd values. Since Gulfstar...
Proceedings Papers

Paper presented at the The Twenty-first International Offshore and Polar Engineering Conference, June 19–24, 2011
Paper Number: ISOPE-I-11-015
... consists of a hard tank with removable helical strakes, a truss section and a square soft tank. Model tests were carried out with truncated mooring system. Uniform current profiles are generated by the current generating system. In this paper, the trajectories of Truss Spar with and without helical strakes...
Proceedings Papers

Paper presented at the The Twentieth International Offshore and Polar Engineering Conference, June 20–25, 2010
Paper Number: ISOPE-I-10-529
... the effectiveness of VIV suppression devices (strake and fairing). This paper summarizes the key experiments reported in the literature for straked Steel Catenary Risers (SCRs). Some recommendations are given for potential future tests to be conducted in this area. INTRODUCTION Steel Catenary Riser (SCR) seems...
Proceedings Papers

Paper presented at the The Eighteenth International Offshore and Polar Engineering Conference, July 6–11, 2008
Paper Number: ISOPE-I-08-421
... cylinder in water with reduced velocity (U/fnD) from 2 to 12, damping factors from 0.2% to 20% of critical damping, mass ratios (m/ D2) from 2.8 to 17, and transverse, inline, and combined inline and transverse motions with up to 1.49 diameters amplitude. Effects of mass ratio, damping, and strakes...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-037
... Vortex Induced Vibrations of Slender Marine Risers Effects of Round-Sectioned Helical Strakes Raed K. Lubbad, Sveinung Løset, Ove T. Gudmestad, Alf Tørum and Geir Moe Norwegian University of Science and Technology (NTNU) Trondheim, Norway ABSTRACT Vortex Induced Vibrations (VIV) may cause great...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-158
... to 0.9m/s represent full-scale velocities. The higher velocities were included for studying multi-mode response and critical Reynolds number response. The umbilical was tested bare and with different straked configurations. The measured data has been extensively studied using statistical analysis, modal...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-253
.... These problems are compounded when designers do not optimize the design of the welds for high frequency fatigue loading. A number of options are available for jumpers that are still in the design phase. These options include VIV suppression strakes, or qualification of the welds to allow for the use of a better...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-332
... fatigue damage viv fatigue damage upstream oil & gas overly conservative low frequency motion scr analysis cycle fatigue lives clad pipe low frequency vessel motion strake petrobras tdp Petrobras P-55 SCR Design - Challenges and Technical Solutions Peter James Simpson, Stael Ferreira...
Proceedings Papers

Paper presented at the The Sixteenth International Offshore and Polar Engineering Conference, May 28–June 2, 2006
Paper Number: ISOPE-I-06-020
... the VIM through the years. The existing reduction techniques are mostly static, such as helical strakes, shrouds, axial slats, streamlined fairing, etc (Blevins, 1990). The strakes, which are the most commonly implemented device, partially suppress the VIM. However, the strakes are expensive...
Proceedings Papers

Paper presented at the The Sixteenth International Offshore and Polar Engineering Conference, May 28–June 2, 2006
Paper Number: ISOPE-I-06-246
..., and presents the model test results. coefficient mooring system leg structure centerwell sway amplitude strake amplitude proceedings configuration drag force current speed cylindrical column model test result sco slanted column offshore structure vortex orientation upstream oil...
Proceedings Papers

Paper presented at the The Fourteenth International Offshore and Polar Engineering Conference, May 23–28, 2004
Paper Number: ISOPE-I-04-310
... ABSTRACT The purpose of this paper is to clarify the effects of height and pitch of helical strakes on the VIV reduction efficiency, and to investigate the hydrodynamic phenomena of an 8-shaped oscillating cylinder with and without helical strakes. Hydrodynamic force measurements of forced...
Proceedings Papers

Paper presented at the The Thirteenth International Offshore and Polar Engineering Conference, May 25–30, 2003
Paper Number: ISOPE-I-03-288
... ABSTRACT This paper presents on experimental study of motions and hydrodynamics of forced oscillating flexible risers covered with helical strakes in calm water. The authors carried out the motion measurements using flexible riser models in order to clarify the effect of strakes on VIV...
Proceedings Papers

Paper presented at the The Twelfth International Offshore and Polar Engineering Conference, May 26–31, 2002
Paper Number: ISOPE-I-02-031
... relay stations, and storage and offloading platforms. It is normally moored by means of conventional spread chains. Due to the deep draft, the spar hull generally has helical strakes to prevent VIV (vortex induced vibration) in current, and shows excellent motion characteristics even in extreme sea...
Proceedings Papers

Paper presented at the The Ninth International Offshore and Polar Engineering Conference, May 30–June 4, 1999
Paper Number: ISOPE-I-99-004
.... The algorithms are described and results are presented that show their efficacy in the hydrodynamic analysis of two structures that are difficult or impossible to analyze with conventional approaches. The example structures are a Mobile Offshore Base and a spar platform with helical strakes. INTRODUCTION...

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